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<html class="">
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	<meta name="description" content="我的学习历程" />
  <meta name="keyword" content="汪一鸣,网页"/>
  <title>欢迎页</title>
  <style>
  div{margin:0 auto; background:#0FF;}
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  .header h1{text-align:center;}
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<body>
	<div class="header">
    <h1>世界你好</h1>
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    <div class="content">
    <img src="sjnh.jpg">
    </div>
</body>
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